Search results for 'back focus' - page 788
DA* 50-135 wow wow wow wow wow wow!!!!!!
It is a great lens, and probably my sharpest next to the FA50mm F1.4 But, and it is a but, I have recently had problems with it not focusing at all. However, either swap lens and swap back, or (today) manually focus in the first instance and it starts talking to the body. Still a bit of a pain, j...
Posted by flossie on 13/09/2010 - 08:15
M 200mm f4 K
No problem. :) Bokeh is the appearance of point of light sources in an out-of-focus area of an image produced by a camera lens using a shallow depth of field. Wikipedia say it so lovely. It's simply how smooth the out of focus part of a photo looks. A good bokeh is smooth and not distracting. ...
Posted by Anvh on 22/06/2009 - 19:34
M 200mm f4 K
What settings did you use Jeanette and did you crop the photos? The first one looks very good, will do some PP on that to pull all the detials out, you might be amazed what is in there. :) The same with the second one, it looks very good. Third one is a bit over exposed I think, the focus m...
Posted by Anvh on 25/06/2009 - 19:42
M 200mm f4 K
No problem Jeanette, sorry I didn't do it sooner. I think you use an wider apeture so more light comes on the sensor but you forgot to adjust the shutterspeed. :wink: You need to premit aperture ring as a setting yes. You can use M-mode and by pressing the green button it will set the correct s...
Posted by Anvh on 25/06/2009 - 20:25
DA 300 + TC
Has anyone used a TC with this lens. Stefan passed a comment in the post asking which 5 lenses would you have. I tried the lens with my Kenko 2 x TC (it has the contacts) but could only be used with manual focus. Would be nice to be able to use AF. Used on K10D. Cedric
Posted by cedricd on 22/06/2009 - 19:18
DA 300 + TC
Hi Cedric yes you can use the Pentax 1.7x Adapter. Put the lens into MF and give it a nudge to bring to close to focus and then let the adapter do the job. But you get normal AF with it. If you want SDM then you will need the Tamron 1.4TC. Just make sure that its the one with 1.4X Pz-AF MC4 ...
Posted by aminstar on 22/06/2009 - 20:04
DA 300 + TC
Very good but very expensive the Pentax 1.7 It has his own focus part so every lenses even old manual ones have auto focus.
Posted by Anvh on 23/06/2009 - 21:42
DA 300 + TC
My Tamron 1.4x MC4 works fine with the 16-50mm and 60-250mm using SDM. The 1.7x also works but of course you lose SDM and you have to manually focus close to the target before it will actually lock on using its own focus.
Posted by Mike-P on 24/06/2009 - 13:25
DA 300 + TC
The PZ (sdm) contacts, the two golden ones in the mount must be working, the SDM signal goes over that. I'm not sure you are correct with this statement. I have tried the DA*300 on a Kenko 1.5x with no operational SDM contacts but the Camera still knew it was an SDM lens so would not focus using t...
Posted by bforbes on 24/06/2009 - 21:26
DA 300 + TC
The PZ (sdm) contacts, the two golden ones in the mount must be working, the SDM signal goes over that. I'm not sure you are correct with this statement. I have tried the DA*300 on a Kenko 1.5x with no operational SDM contacts but the Camera still knew it was an SDM lens so would not focus using t...
Posted by Anvh on 25/06/2009 - 19:13
DA 300 + TC
Hi barrie, This certainly draws a veil over this one then. Thanks for showing the difference. Back to the drawing board now. Cedric :(:(:(
Posted by cedricd on 27/06/2009 - 21:56
DA 300 + TC
Thank you Barrie just what I was looking for, now trying to find out what the contact does :) Just looked at the back of the DA*50-135 and it is the same as the TC back! Rear of the DA*50-135 Rear of the DA 17-70 DA*55 DA*300 From which lens did you took the photo Barri...
Posted by Anvh on 27/06/2009 - 22:01
DA 300 + TC
The missing contact on the "MC" converter if it's the same as my Bower (just took it apart) is there connecting the the back of the bayonet and the converters chip. Spare pin contact and drill required!!:D
Posted by tomkeet on 27/06/2009 - 23:38
DA 300 + TC
From which lens did you took the photo Barrie:?: Also your contacts look silver while these and mine looks gold. Sorry Stefan I am not sure what you mean. The photo was taken with a Sigma 105mm Macro. The photo is of the contacts on the back of the two versions of TC not the contacts on any lens. D...
Posted by bforbes on 28/06/2009 - 00:31
DA 300 + TC
From which lens did you took the photo Barrie:?: Also your contacts look silver while these and mine looks gold. Sorry Stefan I am not sure what you mean. The photo was taken with a Sigma 105mm Macro. The photo is of the contacts on the back of the two versions of TC not the contacts on any lens. D...
Posted by Anvh on 28/06/2009 - 10:13
DA 300 + TC
Oh well - that's me blown out the water then:roll: If r1, r2 and r3 encode the aperture and they are discretes, then only 8 settings would be available. (Grabs camera which currently has 16-50 on - 19 stops between F2.8 and F22 so that doesn't work.) The lens would have to be sending either analo...
Posted by Oggy on 28/06/2009 - 21:29
DA 300 + TC
At least one pin will be required for power for the focus motor (assuming it has single voltage for all functions and uses the chassis for return). I would have thought that the autofocus would require at least one pin for position demand as well. Odd.:roll: Don't know how the contacts really wo...
Posted by Anvh on 28/06/2009 - 23:38
DA 300 + TC
As far as I can tell Stefan, the SDM stator requires 3 wires to it, which sounds to me as if the phase shift controls the position. Your last statement may be on to something because the focus motor always starts in the same direction. It is possible that the drive waveforms are generated within the...
Posted by Oggy on 29/06/2009 - 20:35
DA* 300mm or DA* 60-250mm?
I have not had a chance to use the 60-250 and 300 much, but my initial findings are in terms of detail that the 50-135 produces a better image than the 60-250 and the 300 creams both. This is what I would expect. More to follow. Oggy :) I am no expert in this but in my personal situation if I didn'...
Posted by aminstar on 23/06/2009 - 12:57
DA* 300mm or DA* 60-250mm?
Just back after being away for a couple of days. Thanks for all the comments. Is my mind made up? :? NO!:shock: Still thinking it over. :lol: ali
Posted by alig on 25/06/2009 - 21:20
